Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.
| Chat and workspace agents: channels, DMs and named agents you talk to | 1 | import { ArrowUp, AtSign } from "lucide-react"; |
| 2 | import { type KeyboardEvent, useEffect, useId, useLayoutEffect, useRef, useState } from "react"; | |
| 3 | ||
| 4 | import { AgentPill, MemberAvatar } from "./marks"; | |
| 5 | import { Hint } from "../ui/hint"; | |
| 6 | import { type MentionQuery, type Mentionable, mentionQuery } from "../../lib/chat"; | |
| 7 | ||
| 8 | /** How tall the box grows before it scrolls. */ | |
| 9 | const MAX_HEIGHT = 240; | |
| 10 | ||
| 11 | /** | |
| 12 | * Where a message is written. Enter sends, Shift+Enter starts a new line; | |
| 13 | * `@` offers the workspace's people and agents (Up and Down to move, Tab or | |
| 14 | * Enter to take one, Escape to dismiss). What is typed is kept per | |
| 15 | * conversation while the tab is open, so moving away loses nothing. | |
| 16 | */ | |
| 17 | export function Composer({ | |
| 18 | draftKey, | |
| 19 | placeholder, | |
| 20 | people, | |
| 21 | onSend, | |
| 22 | onTyping, | |
| 23 | disabled, | |
| 24 | autoFocus, | |
| 25 | compact, | |
| 26 | }: { | |
| 27 | draftKey: string; | |
| 28 | placeholder: string; | |
| 29 | people: Mentionable[]; | |
| 30 | onSend: (body: string) => void; | |
| 31 | onTyping?: () => void; | |
| 32 | disabled?: boolean; | |
| 33 | autoFocus?: boolean; | |
| 34 | compact?: boolean; | |
| 35 | }) { | |
| 36 | const box = useRef<HTMLTextAreaElement>(null); | |
| 37 | const [text, setText] = useState(""); | |
| 38 | const [match, setMatch] = useState<MentionQuery | null>(null); | |
| 39 | const [active, setActive] = useState(0); | |
| 40 | const list = useId(); | |
| 41 | ||
| 42 | // The draft for this conversation, if one was left. | |
| 43 | useEffect(() => { | |
| 44 | try { | |
| 45 | setText(sessionStorage.getItem(`chat-draft:${draftKey}`) ?? ""); | |
| 46 | } catch { | |
| 47 | setText(""); | |
| 48 | } | |
| 49 | }, [draftKey]); | |
| 50 | useEffect(() => { | |
| 51 | try { | |
| 52 | if (text) sessionStorage.setItem(`chat-draft:${draftKey}`, text); | |
| 53 | else sessionStorage.removeItem(`chat-draft:${draftKey}`); | |
| 54 | } catch { | |
| 55 | // No storage: the draft lives only while the page does. | |
| 56 | } | |
| 57 | }, [draftKey, text]); | |
| 58 | ||
| 59 | // Grows with what is written, up to a point. | |
| 60 | useLayoutEffect(() => { | |
| 61 | const element = box.current; | |
| 62 | if (!element) return; | |
| 63 | element.style.height = "auto"; | |
| 64 | element.style.height = `${Math.min(MAX_HEIGHT, element.scrollHeight)}px`; | |
| 65 | }, [text]); | |
| 66 | ||
| 67 | const look = () => { | |
| 68 | const element = box.current; | |
| 69 | if (!element) return; | |
| 70 | setMatch(element.selectionStart === element.selectionEnd ? mentionQuery(element.value, element.selectionStart, people) : null); | |
| 71 | setActive(0); | |
| 72 | }; | |
| 73 | ||
| 74 | const complete = (person: Mentionable) => { | |
| 75 | const element = box.current; | |
| 76 | if (!element || !match) return; | |
| 77 | const caret = element.selectionStart; | |
| 78 | const next = `${element.value.slice(0, match.start)}@${person.name} ${element.value.slice(caret)}`; | |
| 79 | setText(next); | |
| 80 | setMatch(null); | |
| 81 | requestAnimationFrame(() => { | |
| 82 | const at = match.start + person.name.length + 2; | |
| 83 | element.focus(); | |
| 84 | element.setSelectionRange(at, at); | |
| 85 | }); | |
| 86 | }; | |
| 87 | ||
| 88 | const send = () => { | |
| 89 | const body = text.trim(); | |
| 90 | if (!body || disabled) return; | |
| 91 | onSend(body); | |
| 92 | setText(""); | |
| 93 | setMatch(null); | |
| 94 | }; | |
| 95 | ||
| 96 | const onKeyDown = (event: KeyboardEvent<HTMLTextAreaElement>) => { | |
| 97 | if (match) { | |
| 98 | const count = match.options.length; | |
| 99 | if (event.key === "ArrowDown" || event.key === "ArrowUp") { | |
| 100 | event.preventDefault(); | |
| 101 | setActive((index) => (index + (event.key === "ArrowDown" ? 1 : count - 1)) % count); | |
| 102 | return; | |
| 103 | } | |
| 104 | if ((event.key === "Tab" || event.key === "Enter") && !event.shiftKey) { | |
| 105 | event.preventDefault(); | |
| 106 | complete(match.options[active] ?? match.options[0]!); | |
| 107 | return; | |
| 108 | } | |
| 109 | if (event.key === "Escape") { | |
| 110 | event.preventDefault(); | |
| 111 | setMatch(null); | |
| 112 | return; | |
| 113 | } | |
| 114 | } | |
| 115 | // Enter sends; Shift+Enter, and Enter while composing an IME word, does not. | |
| 116 | if (event.key === "Enter" && !event.shiftKey && !event.nativeEvent.isComposing) { | |
| 117 | event.preventDefault(); | |
| 118 | send(); | |
| 119 | } | |
| 120 | }; | |
| 121 | ||
| 122 | const open = match != null; | |
| 123 | return ( | |
| 124 | <div className="relative"> | |
| 125 | {match && ( | |
| 126 | <ul | |
| 127 | id={list} | |
| 128 | role="listbox" | |
| 129 | aria-label="Mention someone" | |
| 130 | className="absolute bottom-full left-0 z-20 mb-2 w-full max-w-sm overflow-hidden rounded-lg border border-line-strong bg-raised p-1 shadow-xl shadow-black/40" | |
| 131 | > | |
| 132 | {match.options.map((person, index) => ( | |
| 133 | <li | |
| 134 | key={`${person.kind}:${person.name}`} | |
| 135 | id={`${list}-${index}`} | |
| 136 | role="option" | |
| 137 | aria-selected={index === active} | |
| 138 | onMouseDown={(event) => event.preventDefault()} | |
| 139 | onMouseEnter={() => setActive(index)} | |
| 140 | onClick={() => complete(person)} | |
| 141 | className={`flex cursor-pointer items-center gap-2.5 rounded-md px-2 py-1.5 ${index === active ? "bg-line" : ""}`} | |
| 142 | > | |
| 143 | <MemberAvatar member={person} size={22} /> | |
| 144 | <span className="min-w-0 grow truncate text-sm"> | |
| 145 | <span className="font-medium text-fg">{person.display_name}</span> | |
| 146 | <span className="ml-1.5 text-faint">@{person.name}</span> | |
| 147 | </span> | |
| 148 | {person.kind === "agent" && <AgentPill />} | |
| 149 | </li> | |
| 150 | ))} | |
| 151 | </ul> | |
| 152 | )} | |
| 153 | <div | |
| 154 | className={`rounded-xl border border-line-strong bg-surface transition-colors focus-within:border-accent/35 focus-within:ring-4 focus-within:ring-accent/[0.06] ${disabled ? "opacity-60" : ""}`} | |
| 155 | > | |
| 156 | <textarea | |
| 157 | ref={box} | |
| 158 | value={text} | |
| 159 | rows={1} | |
| 160 | disabled={disabled} | |
| 161 | autoFocus={autoFocus} | |
| 162 | placeholder={placeholder} | |
| 163 | aria-label={placeholder} | |
| 164 | role={open ? "combobox" : undefined} | |
| 165 | aria-autocomplete="list" | |
| 166 | aria-expanded={open} | |
| 167 | aria-controls={open ? list : undefined} | |
| 168 | aria-activedescendant={open ? `${list}-${active}` : undefined} | |
| 169 | autoComplete="off" | |
| 170 | data-1p-ignore | |
| 171 | data-lpignore="true" | |
| 172 | onChange={(event) => { | |
| 173 | setText(event.target.value); | |
| 174 | onTyping?.(); | |
| 175 | }} | |
| 176 | onInput={look} | |
| 177 | onClick={look} | |
| 178 | onKeyDown={onKeyDown} | |
| 179 | onBlur={() => setTimeout(() => setMatch(null), 150)} | |
| 180 | className={`block w-full resize-none bg-transparent px-3.5 text-[0.9375rem] leading-6 text-fg outline-none placeholder:text-faint ${compact ? "pt-2.5 pb-1" : "pt-3 pb-1.5"}`} | |
| 181 | /> | |
| 182 | <div className="flex items-center gap-1 px-2 pb-2"> | |
| 183 | <Hint label="Mention someone"> | |
| 184 | <button | |
| 185 | type="button" | |
| 186 | aria-label="Mention someone" | |
| 187 | disabled={disabled} | |
| 188 | onClick={() => { | |
| 189 | const element = box.current; | |
| 190 | if (!element) return; | |
| 191 | const at = element.selectionStart; | |
| 192 | const before = element.value.slice(0, at); | |
| 193 | const insert = before && !/\s$/.test(before) ? " @" : "@"; | |
| 194 | const next = `${before}${insert}${element.value.slice(at)}`; | |
| 195 | setText(next); | |
| 196 | requestAnimationFrame(() => { | |
| 197 | element.focus(); | |
| 198 | element.setSelectionRange(at + insert.length, at + insert.length); | |
| 199 | setMatch(mentionQuery(next, at + insert.length, people)); | |
| 200 | }); | |
| 201 | }} | |
| 202 | className="flex size-7 items-center justify-center rounded-md text-faint transition-colors hover:bg-raised hover:text-fg" | |
| 203 | > | |
| 204 | <AtSign size={15} /> | |
| 205 | </button> | |
| 206 | </Hint> | |
| 207 | <span className="ml-1 hidden text-[0.6875rem] text-faint sm:inline"> | |
| 208 | <kbd className="font-sans">Enter</kbd> to send · <kbd className="font-sans">Shift+Enter</kbd> for a new line | |
| 209 | </span> | |
| 210 | <button | |
| 211 | type="button" | |
| 212 | aria-label="Send" | |
| 213 | disabled={disabled || !text.trim()} | |
| 214 | onClick={send} | |
| 215 | className="ml-auto flex size-8 items-center justify-center rounded-lg bg-accent text-bg transition-[background-color,opacity] hover:bg-accent-hover disabled:bg-line disabled:text-faint" | |
| 216 | > | |
| 217 | <ArrowUp size={16} strokeWidth={2.4} /> | |
| 218 | </button> | |
| 219 | </div> | |
| 220 | </div> | |
| 221 | </div> | |
| 222 | ); | |
| 223 | } |
